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THE EFFECT OF THRESHOLD VALUE ON THE RESIDUAL FATIGUE LIFETIME OF RAILWAY AXLES
Pokorný, Pavel ; Náhlík, Luboš ; Hutař, Pavel
The fatigue failure of railway axles could have unaccepted consequences. Because of safe operation, it is important to determine the residual fatigue lifetime. The railway axle could contain some cracks either from manufacturing process or from previous service operation. Present defectoscopy can reliably detect only relatively long cracks (longer than 2 mm), see [1]. In other words, there is a risk that the existing crack is not detected by defectoscopy. For conservative establishment of the residual fatigue lifetime the crack, which could be not detected by defectoscopy, must be considered. This paper deals with an effect of the threshold value of fatigue crack propagation on the residual fatigue lifetime of railway axles. Two very commonly used materials for railway axles EA1N and EA4T steels are considered. The results of this paper could be used for safer operation of railway axles.
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Social Motives in the Letter of James
POKORNÝ, Pavel
This bachelor thesis deals with social motives in the Letter of James. Introduction is dedicated to the term "social motive" description and wealthy and poor concepts in biblical tradition. Further on some concrete verses of the Letter to James are investigated (1,9-11; 1,27; 2,2-7; 2,15-16; 4,11; 4,13-17; 5,1-6; 5,14-15). They describe or adjust specific social situations. These passages are analyzed using selected bible commentaries with regards to social evidences in correlation with theological evidences of the letter author. Several possible theological impulses for social work are indicated in the conclusion. They are of course linked to "James's impulses", which are remarkable due to their strong social ethos.
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